The Wonder Book of Knowledge / The Marvels of Modern Industry and Invention, the Interesting Stories of Common Things, the Mysterious Processes of Nature Simply Explained

by Unknown

Footnotes

[1] Illustrations by courtesy of the Lake Torpedo Boat Co., unless otherwise indicated.

[2] The following information and statistics by courtesy of The Panama Canal, Washington office.

[3] Illustrations by courtesy of the Columbia Graphophone Co.

[4] Illustrations by courtesy of the Hendee Manufacturing Co.

[5] Courtesy of the Waltham Watch Company, and “The American Boy.”

[6] Illustrations by courtesy of the Remington Arms-Union Metallic Cartridge Company, unless otherwise indicated.

[7] Illustrations by courtesy of Plymouth Cordage Co.

[8] Illustrations by courtesy of Colt’s Patent Fire Arms Manufacturing Co.

[9] Illustrations by courtesy of Consolidated Fireworks Company of America.

[10] Illustrations by courtesy of Eastman Kodak Company.

[11] Illustrations by courtesy of R. Hoe & Co.

[12] Illustrations by courtesy of the A. I. Root Co.

[13] Illustrations by courtesy of the Hotpoint Electric Heating Co.

[14] Illustrations by the courtesy of the American Telephone and Telegraph Co.

[15] Illustrations by courtesy of the Otis Elevator Co.

[16] Illustrations by courtesy of the International Silver Co.

[17] Illustrations by courtesy of the McClure Co.

[18] Illustrations by courtesy of New York Edison Co., unless otherwise indicated.

[19] Illustrations by courtesy of The Curtis Publishing Co.

[20] Courtesy of George A. Hormel & Co.

[21] Courtesy of The Field, New York City.

[22] Courtesy of The Field, New York City.

[23] Courtesy of the California Redwood Association.

[24] Illustrations by courtesy of The Brunswick-Balke-Collender Co.

[25] Illustrations by courtesy of the American Pin Company.

[26] Illustrations by courtesy of the Common Sense Gum Co. Story by courtesy of the American Chicle Co. and the Common Sense Gum Co.

[27] Illustrations by courtesy of The Brunswick-Balke-Collender Co.

[28] Illustrations by courtesy of the Addressograph Co.

[29] Illustrations by courtesy of the Pyrene Manufacturing Co.

[30] Illustrations by courtesy of Gatchel & Manning.

[31] Courtesy of Mr. Charles L. Trout.

[32] Illustrations by courtesy of the Bethlehem Steel Co.

[33] Illustrations by courtesy of the Bethlehem Steel Co.

[34] Illustrations by courtesy of the Bethlehem Steel Co.

[35] Illustrations by courtesy of the Bethlehem Steel Co.

[36] Illustrations by courtesy of the Bethlehem Steel Co.

[37] Illustrations by courtesy of the Bethlehem Steel Co.

[38] Illustrations by courtesy of the Bethlehem Steel Co.

[39] Illustrations by courtesy of the Bethlehem Steel Co.

[40] Illustrations by courtesy of the Bethlehem Steel Co.

[41] Illustrations by courtesy of the Bethlehem Steel Co.

[42] Illustrations by courtesy of the Bethlehem Steel Co.

[43] Illustrations by courtesy of the Bethlehem Steel Co.

[44] Illustrations by courtesy of the Bethlehem Steel Co.

[45] Illustrations by courtesy of the Bethlehem Steel Co.

[46] Illustrations by courtesy of United Shoe Machinery Co.

[47] Courtesy of James Boyd & Bro., Inc.

[48] Courtesy of American LaFrance Fire Engine Co.

[49] Courtesy of American LaFrance Fire Engine Co.

[50] Courtesy of American LaFrance Fire Engine Co.

[51] Courtesy of American LaFrance Fire Engine Co.

[52] Illustrations by courtesy of American Cyanamid Company.

[53] Courtesy of The Strauss Bascule Bridge Co.

[54] Courtesy of The American Magazine.

[55] Illustrations by courtesy of the Railway Age Gazette and Standard Steel Car Co.

[56] Illustrations by courtesy of Diamond Crystal Salt Co.

[57] Illustrations by courtesy of the General Motors Truck Co.

[58] Illustrations by courtesy of Jacobs & Davies, Engineers.

[59] Illustrations by courtesy of Ford Motor Co.

[60] Courtesy of the Pennsylvania Railroad Co.

[61] Courtesy of the Pennsylvania Railroad Co.

[62] Courtesy of the Pennsylvania Railroad Co.

[63] Courtesy of the Pennsylvania Railroad Co.

[64] Courtesy of the Pennsylvania Railroad Co.

[65] Courtesy of the Pennsylvania Railroad Co.

[66] Courtesy of the General Electric Co.

[67] Courtesy of the Westinghouse Co.

[68] Illustrations by courtesy of International Harvester Company of America, unless otherwise indicated.

[69] Illustrations by courtesy of the Nicholas Power Co.

[70] Illustrations by courtesy of Endicott, Johnson & Co.

[71] Courtesy of Mr. Charles L. Trout.

[72] Illustrations by courtesy of Cutler-Hammer Mfg. Co.

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